Tight end Saubert executed the decisive two-point play for the Seahawks.
Seattle staged a remarkable comeback to overcome the Rams in overtime, clinching their place in the NFL play-offs.
Overcoming a 30-14 deficit in the fourth quarter, the Seahawks triumphed 38-37 at home, registering their fifth straight victory.
While the Rams had become the first to earn a post-season spot earlier on game day, the Seattle team booked their return to the postseason after a two-year absence.
With this outcome, the Seattle have taken over their division's race with a twelve and three mark, supplanting the Los Angeles, who fell to the fifth playoff position with an eleven and four standing.
Quarterback Darnold threw two picks but regrouped to deliver two scoring throws, culminating in the second score to star receiver Smith-Njigba in the extra period.
The Rams held a six-point advantage at half-time before Kenneth Walker III broke free for a long scoring dash for the home side.
Rams cornerback Wallace then took back Darnold's initial interception for a big return, leading to a short touchdown by Corum on the next play.
In the fourth quarter, a scoring pass from Stafford to Puka Nacua pushed the advantage to sixteen points, but Rashid Shaheed provided Seattle's hope with a spectacular punt return.
Darnold then connected with Barner in the endzone, and a converted conversion sent the game into an extra period.
Although Nacua scored for his second TD in overtime, Smith-Njigba responded in kind to set up the game-winning score.
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